Decimal to Binary 10:4 Encoder IC 74147

The Decimal to Binary 10:4 Encoder IC 74147 is a 74-series 10-line to 4-line priority encoder in a 16-pin package. It turns nine active-low decimal inputs (1 to 9) into a 4-bit BCD (binary-coded decimal) output, and when several inputs are active at once it outputs the code of the highest one. Decimal 0 is encoded when no input is active, so the chip has no separate 0 input.

Decimal to Binary 10:4 Encoder IC 74147 Specifications

• Function: 10-line to 4-line (decimal to BCD) priority encoder
• Inputs: 1 to 9, active low (input 9 has the highest priority)
• Outputs: A, B, C, D, active-low (inverted) BCD
• Output pins: A on pin 9, B on pin 7, C on pin 6, D on pin 14
• Pins: 16 (VCC on pin 16, GND on pin 8, pin 15 not connected)
• Supply voltage: 5 V

Decimal to Binary 10:4 Encoder IC 74147 Applications

• Encoding a 0–9 keypad or rotary switch into BCD
• Feeding a BCD-to-7-segment decoder such as the 7447 through inverters
• Reading nine buttons with only four microcontroller pins
• Priority logic circuits
• Digital electronics labs on encoders and decoders

What's in the Box

• 1 × 74147 10-to-4 line priority encoder IC

Tip: Use pull-up resistors on the inputs and connect each switch to GND. The outputs are inverted: with no input active DCBA reads HHHH (decimal 0), and with input 9 active it reads LHHL. Pass the outputs through 7404 inverters, or invert them in software, to get normal BCD. Add a 100 nF capacitor between VCC and GND.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.